Submission #691753

#	Time	Username	Problem	Language	Result	Execution time	Memory
691753		huomark1001	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++14	100 / 100	36 ms	3820 KiB

Main

#include<bits/stdc++.h>
#include<random>

using namespace std;

template<typename T> void _do(T x){cerr<<x<<"\n";}
template<typename T,typename ...U> void _do(T x,U ...y){cerr<<x<<", ";_do(y...);}
#define dbg(...) cerr<<#__VA_ARGS__<<" = ";_do(__VA_ARGS__);

#define ss(n) fixed<<setprecision(n) 
#define ll long long
#define int ll
#define IO ios::sync_with_stdio(false);cin.tie(0);
#define ld long double
#define pb push_back
#define pii pair<int,int>
#define rep(i,a) for(int i=1;i<=a;i++)
#define rep0(i,a) for(int i=0;i<a;i++)
#define F first
#define S second

ll gcd(ll a,ll b){if(b==0) return a; return gcd(b,a%b);}

const ld pi=3.14159265358979323846264338327950288419716939931;
const int lar=3e18;
const int mol1=1e9+7;
const int mol2=998244353;

void solve()
{   
    int n;
    cin>>n;
    int a[n+1];
    rep(i,n) cin>>a[i];
    int l=1,r=n;
    while(l<=n-1&&a[l+1]>a[l]){
        l++;
    }
    while(r>=2&&a[r-1]>a[r]){
        r--;
    }
    int ans=0,pp=0;
    while(l<r){
        if(l==r-1){
            if(a[l]==a[r]) ans++;
            break;
        }
        while(r-1>l&&a[r-1]>a[r]) {
            r--;
        }
        while(l<r-1&&a[l+1]>a[l]) {
            l++;
        }
        if(l==r-1) continue;
        int a1=a[l]-a[l+1],a2=a[r]-a[r-1];
        int mn=min(a1,a2);
        ans+=mn+1;
        pp+=mn+1;
        if(a1==mn){
            l++;
            a[r]-=mn+1;
        }
        else{
            r--;
            a[l]-=mn+1;
        }
    }
    cout<<ans<<"\n";
}

signed main()
{
    IO
    solve();
    return 0;
}

• Subtask 1: 40 / 40
• Subtask 2: 60 / 60